/Engine/Source/Runtime/Engine/Classes/Engine/EngineBaseTypes.h
Types of server travel failures broadcast by the engine
namespace ETravelFailure { enum Type { NoLevel, LoadMapFailure, InvalidURL, PackageMissing, PackageVersion, NoDownload, TravelFailure, CheatCommands, PendingNetGameCreateFailure, CloudSaveFailure, ServerTravelFailure, ClientTravelFailure, } }